We were planning on going to a big birthday bash (which turned out to be a wedding lol) about a week or week and a hlf before my daughters due date. It was barefoot lawn bowls (perfect for my fat pregnant feet!!).... I had every intention of going however didnt end up getting there as my daughter decided that day was going to be her birthday! Anyhow, I was feeling quite good at that time - i wasnt feeling too tired or huge or anything like that, so I thought we'd be fine to go (at least for part of it) and since it was my first baby, i figured that we'd have plenty of time to get back home and to the hospital before I gave birth if I went into labour there.. to be honest though the thought didnt even enter my mind that I might go into labour that day as hubby had kept on telling me she was going to be born later than her due date. I didnt stop going to social outings at all. I still went but just left early sometimes.
If it was a good friend or a family member then I would try to be there, but it is hard with the RSVPing and stuff. Its hard to know how you'll be feeling that far in advance too.I'm sure your friend would understand though if you couldnt go.